tracing updates for 6.3:
- Add function names as a way to filter function addresses - Add sample module to test ftrace ops and dynamic trampolines - Allow stack traces to be passed from beginning event to end event for synthetic events. This will allow seeing the stack trace of when a task is scheduled out and recorded when it gets scheduled back in. - Add trace event helper __get_buf() to use as a temporary buffer when printing out trace event output. - Add kernel command line to create trace instances on boot up. - Add enabling of events to instances created at boot up. - Add trace_array_puts() to write into instances. - Allow boot instances to take a snapshot at the end of boot up. - Allow live patch modules to include trace events - Minor fixes and clean ups -----BEGIN PGP SIGNATURE----- iIoEABYIADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCY/PaaBQccm9zdGVkdEBn b29kbWlzLm9yZwAKCRAp5XQQmuv6qh5iAPoD0LKZzD33rhO5Ec4hoexE0DkqycP3 dvmOMbCBL8GkxwEA+d2gLz/EquSFm166hc4D79Sn3geCqvkwmy8vQWVjIQc= =M82D -----END PGP SIGNATURE----- Merge tag 'trace-v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing updates from Steven Rostedt: - Add function names as a way to filter function addresses - Add sample module to test ftrace ops and dynamic trampolines - Allow stack traces to be passed from beginning event to end event for synthetic events. This will allow seeing the stack trace of when a task is scheduled out and recorded when it gets scheduled back in. - Add trace event helper __get_buf() to use as a temporary buffer when printing out trace event output. - Add kernel command line to create trace instances on boot up. - Add enabling of events to instances created at boot up. - Add trace_array_puts() to write into instances. - Allow boot instances to take a snapshot at the end of boot up. - Allow live patch modules to include trace events - Minor fixes and clean ups * tag 'trace-v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (31 commits) tracing: Remove unnecessary NULL assignment tracepoint: Allow livepatch module add trace event tracing: Always use canonical ftrace path tracing/histogram: Fix stacktrace histogram Documententation tracing/histogram: Fix stacktrace key tracing/histogram: Fix a few problems with stacktrace variable printing tracing: Add BUILD_BUG() to make sure stacktrace fits in strings tracing/histogram: Don't use strlen to find length of stacktrace variables tracing: Allow boot instances to have snapshot buffers tracing: Add trace_array_puts() to write into instance tracing: Add enabling of events to boot instances tracing: Add creation of instances at boot command line tracing: Fix trace_event_raw_event_synth() if else statement samples: ftrace: Make some global variables static ftrace: sample: avoid open-coded 64-bit division samples: ftrace: Include the nospec-branch.h only for x86 tracing: Acquire buffer from temparary trace sequence tracing/histogram: Wrap remaining shell snippets in code blocks tracing/osnoise: No need for schedule_hrtimeout range bpf/tracing: Use stage6 of tracing to not duplicate macros ...
This commit is contained in:
Linus Torvalds
commit
b72b5fecc1
42 changed files with 1112 additions and 220 deletions
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@ -297,7 +297,7 @@ bool mac_pton(const char *s, u8 *mac);
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*
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* Use tracing_on/tracing_off when you want to quickly turn on or off
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* tracing. It simply enables or disables the recording of the trace events.
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* This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
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* This also corresponds to the user space /sys/kernel/tracing/tracing_on
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* file, which gives a means for the kernel and userspace to interact.
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* Place a tracing_off() in the kernel where you want tracing to end.
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* From user space, examine the trace, and then echo 1 > tracing_on
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@ -33,6 +33,18 @@ struct trace_array;
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int register_ftrace_export(struct trace_export *export);
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int unregister_ftrace_export(struct trace_export *export);
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/**
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* trace_array_puts - write a constant string into the trace buffer.
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* @tr: The trace array to write to
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* @str: The constant string to write
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*/
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#define trace_array_puts(tr, str) \
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({ \
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str ? __trace_array_puts(tr, _THIS_IP_, str, strlen(str)) : -1; \
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})
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int __trace_array_puts(struct trace_array *tr, unsigned long ip,
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const char *str, int size);
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void trace_printk_init_buffers(void);
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__printf(3, 4)
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int trace_array_printk(struct trace_array *tr, unsigned long ip,
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@ -95,6 +95,7 @@ extern void trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
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extern int trace_seq_hex_dump(struct trace_seq *s, const char *prefix_str,
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int prefix_type, int rowsize, int groupsize,
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const void *buf, size_t len, bool ascii);
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char *trace_seq_acquire(struct trace_seq *s, unsigned int len);
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#else /* CONFIG_TRACING */
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static inline __printf(2, 3)
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@ -139,6 +140,10 @@ static inline int trace_seq_path(struct trace_seq *s, const struct path *path)
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{
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return 0;
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}
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static inline char *trace_seq_acquire(struct trace_seq *s, unsigned int len)
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{
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return NULL;
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}
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#endif /* CONFIG_TRACING */
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#endif /* _LINUX_TRACE_SEQ_H */
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@ -482,7 +482,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
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* * This is how the trace record is structured and will
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* * be saved into the ring buffer. These are the fields
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* * that will be exposed to user-space in
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* * /sys/kernel/debug/tracing/events/<*>/format.
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* * /sys/kernel/tracing/events/<*>/format.
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* *
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* * The declared 'local variable' is called '__entry'
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* *
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@ -542,7 +542,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
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* tracepoint callback (this is used by programmatic plugins and
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* can also by used by generic instrumentation like SystemTap), and
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* it is also used to expose a structured trace record in
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* /sys/kernel/debug/tracing/events/.
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* /sys/kernel/tracing/events/.
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*
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* A set of (un)registration functions can be passed to the variant
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* TRACE_EVENT_FN to perform any (un)registration work.
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